Method for controlling uplink transmission power and wireless device using same

Abstract

The present invention relates to a method for controlling uplink transmission power and to a wireless device using same in a wireless communication system. The wireless device receives determines uplink transmission power in consideration of the overlap period between subframes between a first serving cell belonging to a first timing advance (TA) group and a second serving cell belonging to the second TA group, and transmits an uplink channel on the basis of the uplink transmission power.

What is claimed is: 
     
       1. A method for controlling an uplink transmit power in a wireless communication system, the method comprising:
 determining, by a user equipment, a first maximum power reduction (MPR) for a first duration of a subframe considering a transmission on all of a plurality of serving cells; 
 determining, by the user equipment, a second MPR for a second duration of the subframe considering a transmission on all of the plurality of serving cells; 
 determining, by the user equipment, an uplink transmit power based on a maximum value of the first MPR and the second MPR; and 
 transmitting, by the user equipment, uplink data using the determined uplink transmit power in the subframe. 
 
     
     
       2. The method of  claim 1 , wherein the uplink data is transmitted on a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH). 
     
     
       3. The method of  claim 1 , wherein the first duration is not overlapped with the second duration in the subframe. 
     
     
       4. The method of  claim 1 , wherein the plurality of serving cells are configured as an intra-band carrier aggregation. 
     
     
       5. The method of  claim 1 , wherein one of the plurality of serving cells is a primary cell. 
     
     
       6. A user equipment for controlling an uplink transmit power in a wireless communication system, the user equipment comprising:
 a radio frequency (RF) unit configured to transmit and receive a radio signal; and 
 a processor operatively coupled to the RF unit and configured to: 
 determine a first maximum power reduction (MPR) for a first duration of a subframe considering a transmission on all of a plurality of serving cells; 
 determine a second MPR for a second duration of the subframe considering a transmission on all of the plurality of serving cells; 
 determine an uplink transmit power based on a maximum value of the first MPR and the second MPR; and 
 instruct the RF unit to transmit uplink data using the determined uplink transmit power in the subframe. 
 
     
     
       7. The user equipment of  claim 6 , wherein the uplink data is transmitted on a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH). 
     
     
       8. The user equipment of  claim 6 , wherein the first duration is not overlapped with the second duration in the subframe. 
     
     
       9. The user equipment of  claim 6 , wherein the plurality of serving cells are configured as an intra-band carrier aggregation. 
     
     
       10. The user equipment of  claim 6 , wherein one of the plurality of serving cells is a primary cell.